Roll grinding machine



P 29, 1942- A. w; WIGGLESWORTH ROLL GRINDING MACHINE Filed Oct. 4, i940 4 Sheets-Sheet 1 p 29, 2- A. w. vyleLEswoR'rl-l 2,297,093

ROLL GRINDING MACHINE Q Filed Oct. 4, 1940 4 Sheets-Sheet .2

P 1942- A. w. WIGGLE-SWORTH ROLL GRINDING MACHINE Filed Oct. 4:, 1940 4 Sheets-Sheet 3 gem [J24 bazaar/4 A. W. WIGGLESWORTH Sept. 29, 1942.

ROLL GRINDING MACHINE 4 Sheets-Sheet 4 Filed Oct. 4, 1940 Q www KIWI %T N\ \QQ v r J Patented Sept. 29, 1942 oi'rso' smrss ROLL GRINDING MACHINE Albert W. Wigglesworth, Miami Beach, Fla assignor to Hill-Clarke Machinery 00., Chicago, 111., a corporation of Illinois Application October 4, 1940, Serial No. 359,691

Claims.

This invention relates to grinding machines and particularly to grinding machines adapted to grind rolls having crowned, concave, or specially formed surfaces.

Grinding machines comprise a base on which are slidably mounted a longitudinally reciprocable work carriage and a transverselymovable wheel base on which the grinding wheel and motor are mounted so that the rotatable grinding wheel may be moved, with the transversely movable base, into operative position relatively to the longitudinally reciprocable carriage and the work thereon.

The main object of my invention is to provide grinding machines of the character described with means for automatically grinding rolls having crowned or concave surfaces, said means being embodied in the grinding machines in such manner that the conventional mounting of the grinding wheel on a transversely movable base and the movement of the base in a horizontal plane are not altered, and consequently the efficiency of the machines is not impaired and undue wear of the machine parts is avoided.

It has been proposed heretofore to tilt the grinding wheel base intermittently by raising and lowering its rearward end and thereby to change the position of the grinding wheel relatively to the work as the work is being moved past the wheel, but the construction and operation are objectionable in that the wheel base and the wheel mounted thereon are not uniformly and efiiciently supported while in the tilted positions and the line contact between the grinding wheel and the work is not in one horizontal plane during the entire grinding operation.

The invention herein described provides means for automatically moving the grinding wheel base transversely and in a horizontal plane while the rotating work is being moved longitudinally a predetermined distance past the rotating grinding wheel on said base, whereby the work is given a concave or convex surface, as desired.

smoothness and regularity of the ground surface as well as true contours of the convex or concave form are insured by the construction herein disclosed. These are qualities in the work which are not obtainable when the grinding wheel and its base are not uniformly supported on the machine base and the grinding wheel trunnions bear the load developed in the grinding operation.

In the drawings:

Fig. 1 is a transverse sectional view, partly in elevation, of a grinding machine embodying, my

invention, taken in the plane of the line i"-l' of Fig. 2.

Fig. 2 is a plan view of part of the machine shown in Fig. l.

Fig.3 is a rear elevation of part of the machine shown in Figs. 1 and 2.

Fig. 4 is a longitudinal, vertical sectional view, taken in the plane of the line 6-4 of Fig; 1.

Fig. 5 is a transverse, vertical sectional view, taken in the plane of the lines 5- 5 of Figs. 2' and 3.

Fig. 6 is a'horizontal sectional view, partly inplan elevation, taken in the plane of the line 66 ofFig. 5.

A complete grinding machine has not been shown in the drawings, but reference is made to my Patent No. 2,074,308 dated March 16, 1937, which shows the type of grinding machine in which my'inventionhas been embodied.

In that embodiment shown in the drawings, the machine base it supports a longitudinally reciprocable work carriage l l which isslidable on the base it]. A conventional tail stock is indicated at it! and a head stock at l3. The head and tail stocks are rotatably mounted on the carriage and are moved therewith. The carriage is reciprocated on the base it by any suitable means, not shown, such for example as the mechanism described in my'aforesaid patent.

A grinding wheel I4 is mounted on a wheel base it on bearings i5, and a motor I! is also mounted on a, raised portion of said wheel base l5. The motor shaft l'fi'has mounted on it a pulley l9 operatively connected by belts 26 to the pulley 21 on the shaft 22 on which the grinding wheel M is mounted;

The wheel base 15 is not mounted directly on the machine base It, as shown in the prior art, but rests on an intermediate base or support 23 which is movable transversely of the base Hi. The position of the intermediate support 23 relatively to the machine base Ill is adjusted by means of a hand wheel 24 on a transverse shaft 25 provided with a screw threaded portion it? which engages the half nut 21 fixed; on the bottom of the intermediate support 2-3. By actuating; the hand wheel 26, the position of the support 23', as well as the wheel base it and grindingi wheel Id, are adjusted to bring the wheel it into operative position relatively to the wor such as the roll 28 shown in Fig. 2'.

If the wheel base I 5 were fixedly mounted on the intermediate support 23, adjustment of the position of the latter on the base It. would result in the 'work; contacting, portion of the grinding The gear 32 on the shaft 38 rotates the gear 33, thus actuating the shaft 34 on which said gear 33 is fixed. The shaft 34 has the gear 36 keyed to it and therefore gear 36 rotates the idler gear 31 which meshes with the gear 40, thereby rotating the shaft 4|, beveled gear 46, gear 41, shaft 48 and ecentric 49. The latter is a circular disc with its shaft receiving hole slightly off center, and when a crowned roll is to be produced, the eccentric is so positioned on the shaft 48 that the portion of smallest radius will be exactly contacting the The means for automatically moving the wheel base |'5 relatively to the intermediate support 23; transversely of the base l0, comprises the following mentioned parts. The longitudinally extending rack 28' fixed on the bottom of the work carriage ll meshes with a gear 29 on the rotatable shaft 38 extending through the frame members 3| of the machine, the gear 32 keyed to a sleeve 32' on the shaft meshing with a large gear 33 keyed to the stub shaft 34. The sleeve 32' is slidable on but keyed to the rearward portion of the shaft 30. The stub shaft 34 extends through -a bracket 35 which carries the change speed gearing about to be described. The end of the shaft 30 and sleeve 32' are also mounted in the bracket 35.

Fixed on the outer or rearward end of the shaft 34 is a gear 36 which meshes with an idler gear 31 adjustably mounted in a slotted lever or quadrant 38 by a pin 39. The idler gear 31 meshes with a large gear 40 mounted on a shaft 4| which extends through the bracket 35. The slotted lever 38 is mounted on the rearwardly projecting hub of the bracket 35. The slotted lever 38 and the idler gear 31 can be adjusted in desired position to accommodate different sized gears by means of a nut and bolt 42, the bolt extending through a slot 43 at one side of the lever 38. The bolt extends through said slot 43 and into a, hole 44 in the bracket 35.

The bracket 35, carrying the gearing described, is fixedly secured to the intermediate support 23 by bolts 45, in such position that the shaft 4| is slightly lower than the support. end of said shaft 4| is a bevel gear 46 which meshes with a bevel gear 41 on a vertical shaft 48 which extends through the intermediate support v23. On the upper end of the shaft 48 is keyed an eccentric 49 held on the shaft by the 4 nut 58.

The eccentric 49 has peripheral contact with a plate 5|, vertically disposed and part of a casting 52 bolted at 52' to the wheel base l'5. At each side of the casting 52, fixedly mounted on the intermediate support 23, is a block 53 through which extends a rod 54 having an end fixedly secured to the wheel base l5 as best shown in Figs. 5 and 6. The oposite end extends beyond the block 53 and has a nut 55, washer 56 and spring 51 thereon, the spring being com-pressed between the block 53 and washer 56.

The operation of the means for automatically varying the position of the wheel base |5 relatively to the intermediate base support 23 after the latter shall have been moved to adjusted position to bring the grinding wheel l4 into operative position (by actuating the hand wheel 24 and shaft 25-26 engaging the half nut 21 on said support 23) is as follows:

The driven reciprocating carriage through its rack 28 meshing with gear23, rotates the shaft 36 first in one direction and then in the other, the rotation in one direction continuing while the carriage is being moved in one direction.

On the inner center of the plate 5| of the casting '52 when the grinding wheel is contacting the exact longitudinal center of the roll 28.

The eccentric 49 bears peripherally on the plate 5| of the casting 52 on the wheel base l5, and when the base I5 is moved toward the work by 'said cam action, the springs 51 are compressed between the blocks 53 and washers '56 on the rods 54. When the eccentric has moved to a position wherein the portion having the smallest radius is contacting said plate 5|, the expansive power of the springs 51 causes the wheel base |5 to move rearwardly to the extent permitted by the engagement between the eccentric and said plate 5| on the casting 52 on the wheel base 15.

' Ec centri cs of different sizes can be interchanged and thus avoid the necessity for interchanging gears on the bracket 35 to vary the speed of rotation of the eccentric as required by the work to be ground.

When it is desired to use the grinding machine for straight grinding, and movement of the wheel base I 5 on the intermediate support 23 is not required, the eccentric 49 can be rendered inoperative by removing the screw '58 which extends through the lower portion of the bracket 35 into the recess 59 in the sleeve 32'. Then the sleeve 32' can be moved forwardly in order to move the gear 32 (slidably mounted on shaft 38) out of mesh with the gear 33. The screw 58 is then reinserted so as to engage the recess 60 in the sleeve 32', thus holding the gear 32 in nonoperative position.

The adjustment of the cam or eccentric 49 to its proper operative position for producing rolls of varying contours or profiles is obtained by first disengaging the operative connection between the shaft 30 and gear 33 by moving the sleeve 32' forwardly on the shaft 30. As just explained, this causes the gear 32 to be disengaged from the gear 33. Then the shaft 4| can be turned, thereby actuating the bevel gears 46 and 41, and rotating the shaft 48 to move the cam 49 to desired position. When the sleeve 32' has been returned to operative position so that the gear 32 again meshes with the gear 33, all the parts will be in proper operative position for producing rolls having the profile for which the cam 49 has .been adjusted. It will be understood, of course, that the shape of the cam or eccentric 49 can be varied so as to produce concave, convex or other special forms. Whenever reference is made herein to means for automatically grinding convex and concave surfaces on the work, it is intended that this element include means for forming convex, concave or other specially formed surfaces on the work.

It will be understood that the adjustment of the position of the intermediate base support 23 can be accomplished by means of the parts 2421, as explained, Without interference with the means for operating the eccentric 49 because of the sliding engagement between the shaft 38 and the sleeve 32' keyed to said shaft.

Changes may be made in details of construction without departing from the scope of my invention.

I claim:

1. A grinding machine provided with means for automatically grinding convex and concave surfaces on the work, comprising a machine base, a longitudinally reciprocable work carriage on the machine base, a grinding wheel base, a grinding wheel rotatably mounted on the base, an intermediate support for the wheel base slidable transversely on the machine base, said wheel base resting on said intermediate support, and means operatively connected with the work carriage and with the grinding wheel base for automatically varying the position of said wheel base relatively to the intermediate support, said means comprising a shaft extending transversely of the machine, engaging means on the work carriage and shaft for rotating the shaft, an eccentric mounted on the intermediate base support, operative connections between the transverse shaft and said eccentric for actuating the eccentric, said eccentric being located to bear peripherally on the wheel base and to move said base toward the work carriage, and means moving the wheel base in the reverse direction, said last mentioned means comprising a horizontal rod fixedly secured to the wheel base, a block secured to the intermediate base, the rod extending through the block, a stop member on the free end of the rod, and a coiled spring on the rod between the block and the stop.

2. A grinding machine provided with means for automatically grinding convex and concave surfaces on the work, comprising a machine base, a longitudinally reciprocable work carriage on the machine base, a, grinding wheel base, a grinding wheel rotatably mounted on the base, an intermediate support for the wheel base slidable transversely on the machine base, said wheel base resting on said intermediate support, and.

means operatively connected with the work carriage and with the grinding wheel base for automatically varying the position of said wheel base relatively to the intermediate support, said means comprising a shaft extending transversely of the machine, engaging means on the work carriage and shaft for rotating the shaft, a bracket fixedly mounted on the intermediate support, gearing mounted on the bracket, a gear on the shaft in mesh with a gear on the bracket, a slotted lever pivotally connected to the bracket, an idler gear adjustably mounted on the slotted lever, means for adjusting the pivotal position of the lever relatively to the bracket, an eccentric mounted on the intermediate support and operatively connected with a gear on said bracket, the eccentric being positioned to bear peripherally on the grinding wheel base and to move it toward the work carriage, and means for moving the wheel base in the reverse direction.

3. A grinding machine provided with means for automatically grinding convex and concave surfaces on the work, comprising a machine base, a longitudinally reciprocable work carriage on the machine base, a grinding wheel base, a grinding wheel rotatably mounted on the base, an intermediate support for the wheel base slidable transversely on the machine base, said wheel base resting on said intermediate support, and means operatively connected with the work carriage and with the grinding wheel base for automatically varying the position of said wheel base relatively to the intermediate support, said means comprising a shaft extending transversely of the machine, engaging means on the work carriage and shaft for rotating the shaft, an eccentric mounted on the intermediate base support, operative connections between the transverse shaft and said eccentric for actuating the eccentric, said operative connections including a slidable gear on the transverse shaft, means for moving said gear and means for retaining it in nonoperative position to render the eccentric inoperative, said eccentric being located to bear peripherally on the wheel base and to move said base toward the Work carriage, and means moving the wheel base in the reverse direction.

4. A grinding machine provided with means for automatically grinding convex and concave surfaces on the work, comprising a machine base, a longitudinally reciprocable work carriage 0n the machine base, a grinding wheelbase, a grinding wheel rotatably mounted on the base, an intermediate support for the wheel base slidable transversely on the machine base, said wheel base resting on said intermediate support, means including an eccentric operatively connected with the grinding wheel base, and operative connections between said eccentric means and the reciprocable work carriage gradually and continuously reciprocating said wheel base in a horizontal plane on said intermediate support while the work carriage is being reciprocated and the grinding wheel is in contact with the work, and said wheel base having a lower bearing surface which is throughout its area in constant contact with the intermediate support while said wheel base is being gradually reciprocated on said support during the work grinding operation.

5. The grinding machine covered by claim 4 in which the position of the intermediate support is adjustable transversely of the machine base relatively to the work carriage and in which said operative connection between the eccentric means and the work carriage includes a slidable connection compensating for adjustment of the position of the intermediate support relatively to the work carriage and machine base.

ALBERT W. WIGGLESWORTH. 

